Projection screen holding frame assembly

Abstract

A holding frame assembly has a main frame, an outer frame, a gap, and multiple elastic members. The main frame is rectangular in shape and has two lateral main frame rods, two longitudinal main frame rods, four L-shaped connection elements, and multiple main frame securing fasteners. The L-shaped connection elements are disposed respectively at four connected portions of the lateral main frame rods and the longitudinal main frame rods to connect the main frame rods together by the main frame securing fasteners. The outer frame is mounted around the main frame by multiple outer frame fasteners and is composed of two lateral outer frame rods and two longitudinal outer frame rods. The gap is defined between the outer frame and the main frame. The elastic members are disposed between the main frame and the outer frame and are connected with the main frame.

What is claimed is: 
     
       1. A projection screen holding frame assembly comprising:
 a main frame being rectangular in shape and comprising
 two lateral main frame rods and two longitudinal main frame rods connected with the two lateral main frame rods to hold a projection screen on the main frame in an expansion state; 
 four L-shaped connection elements disposed respectively at four connected portions of the two lateral main frame rods and the two longitudinal main frame rods to connect the two lateral main frame rods and the two longitudinal main frame rods; and 
 multiple main frame securing fasteners connected securely with the L-shaped connection elements, the two lateral main frame rods, and the two longitudinal main frame rods; 
 
 an outer frame mounted around the main frame by multiple outer frame fasteners and composed of two lateral outer frame rods and two longitudinal outer frame rods, wherein the two lateral outer frame rods are fixed respectively to the two lateral main frame rods and outer surfaces of corresponding two of the L-shaped connection elements and the two longitudinal outer frame rods are fixed respectively to the two longitudinal main frame rods and outer surfaces of corresponding two of the L-shaped connection elements; 
 a gap defined between the outer frame and the main frame to allow the projection screen to pass through the gap; and 
 multiple elastic members disposed between the main frame and the outer frame and connected with the main frame to connect with a periphery of the projection screen. 
 
     
     
       2. The projection screen holding frame assembly as claimed in  claim 1 , wherein
 each one of the two lateral main frame rods and the two longitudinal main frame rods of the main frame comprises at least one main rod element; 
 each one of the at least one main rod element of each one of the two lateral main frame rods and the two longitudinal main frame rods comprises
 a main rod body having
 an inner side edge; and 
 an outer side edge being curved in shape and protruding from a rear side of the main rod body; 
 
 a connection hole defined in the main rod body; 
 a holding space defined in the rear side of the main rod body; and 
 a connection groove defined in the rear side of the main rod body at a position adjacent to the inner side edge; 
 
 the elastic members are held in the holding spaces of the main rod bodies of the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods; 
 each L-shaped connection element comprises
 a base segment being square in shape and having an inner corner and an outer corner defined respectively at two ends of a diagonal line of the base segment; 
 two connection arms connected respectively with two side edges of the base segment adjacent to the inner corner and inserted respectively into the connection holes in the main rod bodies of the main rod elements of two of the main frame rods connected with the L-shaped connection element; 
 a supporting segment formed on and protruding from a rear side of the base segment and extending from the outer corner toward the inner corner of the base segment; 
 
 each one of the two lateral outer frame rods and the two longitudinal outer frame rods of the outer frame has two ends respectively having an inclined end edge at an angle of 45° and comprises at least one outer rod element; 
 each one of the at least one outer rod element of the two lateral outer frame rods and the two longitudinal outer frame rods comprises
 an outer rod body having two side edges; 
 a decorative board formed on and protruding from a front side of the outer rod body at one of the two side edges of the outer rod body and having a curved front end opposite the outer rod body; 
 a connection board formed on and protruding from the front side of the outer rod body at the other side edge of the outer rod body opposite the decorative board and inserted into the connection groove in a corresponding one of the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods; and 
 an abutment segment formed on and protruding from the front side of the outer rod body at a position adjacent to the decorative board; 
 
 the supporting segment of each L-shaped connection element abuts ends of two of the outer rod elements of the two lateral outer frame rods and the two longitudinal outer frame rods; 
 the outer frame fasteners are connected with the ends of the outer rod elements of the two lateral outer frame rods and the two longitudinal outer frame rods and the L-shaped connection elements; and 
 the gap is defined between the decorative boards of the outer rod elements of the two lateral outer frame rods and the two longitudinal outer frame rods and the outer side edges of the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods. 
 
     
     
       3. The projection screen holding frame assembly as claimed in  claim 2 , wherein each one of the two lateral main frame rods and the two longitudinal main frame rods includes multiple main rod elements and at least one T-shaped connecting member disposed between the main rod elements of the main frame rod to connect the main rod elements together; and
 multiple supporting rods are respectively connected between corresponding T-shaped connecting elements of the two lateral main frame rods and the two longitudinal main frame rods. 
 
     
     
       4. The projection screen holding frame assembly as claimed in  claim 3 , wherein
 each one of the at least one T-shaped connecting element of each one of the two lateral main frame rods and the two longitudinal main frame rods comprises
 a main body being rectangular in shape and having four side edges and two supporting protrusions formed on a rear side of the main body, wherein each supporting protrusion has a connecting hole connected with a bolt that is mounted through a corresponding one of the main rod elements connected with the T-shape connecting element; and 
 three arms respectively formed on and extending from three of the four side edges of the main body, including two opposite side arms and a middle arm, and each having at least one fastening hole, wherein the two opposite side arms are inserted respectively into the connection holes of two of the main rod elements connected with the T-shaped connecting element; and 
 
 the middle arm is connected with the supporting rod connected with the T-shaped connecting element. 
 
     
     
       5. The projection screen holding frame assembly as claimed in  claim 4 , wherein the outer frame further comprises four L-shaped corner protectors mounted respectively on four corners of the outer frame and holds the ends having the inclined end edges of the two lateral outer frame rods and the two longitudinal outer frame rods of the outer frame inside the corner protectors. 
     
     
       6. The projection screen holding frame assembly as claimed in  claim 5 , wherein
 each of the elastic members is a spring; and 
 the main frame further comprises multiple connecting hooks mounted on the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods of the main frame and connected respectively with the elastic members. 
 
     
     
       7. The projection screen holding frame assembly as claimed in  claim 6  further comprising multiple supporting members connected with the two lateral main frame rods of the main frame, and each supporting member comprising
 a main segment having two opposite side edges; 
 an abutment segment formed on and extending upward from one of the two opposite side edges of the main segment, extending into an opening defined in the inner side edge of a corresponding one of the at least one main rod element of a corresponding one of the two lateral main frame rods, and abutting an inner surface of the main rod body of the corresponding main rod element; and 
 a securing segment formed on and extending downward from the other side edges of the main segment opposite the abutment segment and having multiple securing through holes. 
 
     
     
       8. The projection screen holding frame assembly as claimed in  claim 4 , wherein each L-shaped connection element further has two abutment protrusions formed on the rear side of the base segment of the L-shaped connection element, abutting respectively on ends of corresponding two of the two lateral outer frame rods and the two longitudinal outer frame rods of the outer frame, and each abutment protrusion having a threaded hole. 
     
     
       9. The projection screen holding frame assembly as claimed in  claim 8 , wherein
 each elastic member is a spring; 
 the main frame further comprises multiple connecting hooks mounted on the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods of the main frame and connected respectively with the elastic members; 
 each L-shaped connection element further has a spring mount formed on the rear side of the base segment of the L-shaped connection element and having two spring holes connected respectively with two of the elastic members. 
 
     
     
       10. The projection screen holding frame assembly as claimed in  claim 9 , wherein
 each L-shaped connecting element further has
 an alignment line formed on the rear side of the base segment of the L-shaped connection element and being perpendicular to one of the side edges of the base segment adjacent to the alignment line; and 
 an inclined line formed on the rear side of the base segment of the L-shaped connection element and being inclined at an angle of 45° relative to one of the side edges of the base segment adjacent to the inclined line. 
 
 
     
     
       11. The projection screen holding frame assembly as claimed in  claim 4  further comprising multiple supporting members connected with the two lateral main frame rods of the main frame, and each supporting member comprising
 a main segment having two opposite side edges; 
 an abutment segment formed on and extending upward from one of the two opposite side edges of the main segment, extending into an opening defined in the main rod body of a corresponding one of the at least one main rod element of a corresponding one of the two lateral main frame rods, and abutting an inner surface of the main rod body of the corresponding main rod element; and 
 a securing segment formed on and extending downward from the other side edges of the main segment opposite the abutment segment and having multiple securing through holes. 
 
     
     
       12. The projection screen holding frame assembly as claimed in  claim 4 , wherein
 each elastic member is a spring; and 
 the main frame further comprises multiple connecting hooks mounted on the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods of the main frame and connected respectively with the elastic members. 
 
     
     
       13. The projection screen holding frame assembly as claimed in  claim 12  further comprising multiple supporting members connected with the two lateral main frame rods of the main frame, and each supporting member comprising
 a main segment having two opposite side edges; 
 an abutment segment formed on and extending upward from one of the two opposite side edges of the main segment, extending into an opening defined in the main rod body of a corresponding one of the at least one main rod element of a corresponding one of the two lateral main frame rods, and abutting an inner surface of the main rod body of the corresponding main rod element; and 
 a securing segment formed on and extending downward from the other side edges of the main segment opposite the abutment segment and having multiple securing through holes. 
 
     
     
       14. The projection screen holding frame assembly as claimed in  claim 2 , wherein
 each elastic member is a spring; and 
 the main frame further comprises multiple connecting hooks mounted on the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods of the main frame and connected respectively with the elastic members. 
 
     
     
       15. The projection screen holding frame assembly as claimed in  claim 14  further comprising multiple supporting members connected with the two lateral main frame rods of the main frame, and each supporting member comprising
 a main segment having two opposite side edges; 
 an abutment segment formed on and extending upward from one of the two opposite side edges of the main segment, extending into an opening defined in the main rod body of a corresponding one of the at least one main rod element of a corresponding one of the two lateral main frame rods, and abutting an inner surface of the main rod body of the corresponding main rod element; and 
 a securing segment formed on and extending downward from the other side edges of the main segment opposite the abutment segment and having multiple securing through holes. 
 
     
     
       16. The projection screen holding frame assembly as claimed in  claim 2 , wherein each L-shaped connection element further has two abutment protrusions formed on the rear side of the base segment of the L-shaped connection element, abutting respectively on ends of corresponding two of the two lateral outer frame rods and the two longitudinal outer frame rods of the outer frame, and each having a threaded hole. 
     
     
       17. The projection screen holding frame assembly as claimed in  claim 16 , wherein
 each elastic member is a spring; 
 the main frame further comprises multiple connecting hooks mounted on the main rod elements of the two lateral main frame rods and the two longitudinal main frame rods of the main frame and connected respectively with the elastic members; and 
 each L-shaped connection element further has a spring mount formed on the rear side of the base segment of the L-shaped connection element and having two spring holes connected respectively two of the elastic members. 
 
     
     
       18. The projection screen holding frame assembly as claimed in  claim 17 , wherein
 each L-shaped connecting element further has
 an alignment line formed on the rear side of the base segment of the L-shaped connection element and being perpendicular to one of the side edges of the base segment adjacent to the alignment line; and 
 an inclined line formed on the rear side of the base segment of the L-shaped connection element and being inclined at an angle of 45° relative to one of the side edges of the base segment adjacent to the inclined line. 
 
 
     
     
       19. The projection screen holding frame assembly as claimed in  claim 2  further comprising multiple supporting members connected with the two lateral main frame rods of the main frame, and each supporting member comprising
 a main segment having two opposite side edges; 
 an abutment segment formed on and extending upward from one of the two opposite side edges of the main segment, extending into an opening defined in the main rod body of a corresponding one of the at least one main rod element of a corresponding one of the two lateral main frame rods, and abutting an inner surface of the main rod body of the corresponding main rod element; and 
 a securing segment formed on and extending downward from the other side edges of the main segment opposite the abutment segment and having multiple securing through holes.